ZHCSC46C February   2014  – June 2021 INA300

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings (1)
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Requirements
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Selecting a Current-Sensing Resistor
        1. 7.3.1.1 Selecting a Current-Sensing Resistor: Example
      2. 7.3.2 Setting The Current-Limit Threshold
        1. 7.3.2.1 Resistor-Controlled Current Limit
        2. 7.3.2.2 Voltage Source-Controlled Current Limit
      3. 7.3.3 Delay Setting
      4. 7.3.4 Alert Timing Response
      5. 7.3.5 Selectable Hysteresis
      6. 7.3.6 Alert Output
      7. 7.3.7 Noise Adjustment Factor (NAF)
    4. 7.4 Device Functional Modes
      1. 7.4.1 Alert Mode
        1. 7.4.1.1 Transparent Output Mode
        2. 7.4.1.2 Latch Output Mode
      2. 7.4.2 Disable Mode
      3. 7.4.3 Input Filtering
      4. 7.4.4 Using the INA300 INA300 With Common-Mode Transients Above 36 V
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Unidirectional Operation
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curve
      2. 8.2.2 Bidirectional Operation
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curve
      3. 8.2.3 Window Comparator
        1. 8.2.3.1 Design Requirements
        2. 8.2.3.2 Detailed Design Procedure
        3. 8.2.3.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 接收文档更新通知
    3. 11.3 支持资源
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 术语表
  12. 12Mechanical, Packaging, and Orderable Information

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7.3.4 Alert Timing Response

The device has a 10-µs internal comparison window where the input signal is measured to compare to the limit threshold voltage. This window continuously runs internal to the device without any external indicator or control. A comparison is made at the completion of each 10-µs comparison window to determine if the averaged input over the comparison window exceeds the limit threshold, thus indicating if an overcurrent event has occurred.

This comparison window is not synchronized with the input signal so there is an unknown timing component present. With this free-running internal timing window, an overcurrent event can occur anywhere within the 10-µs comparison window. This condition causes a variation in the amount of time before the alert appears at the output because the comparison is always made at the end of the 10-µs comparison window. Figure 7-3 shows the variation in time between when the input signal rises above the threshold voltage and when a change at the alert output terminal occurs.

GUID-B4565384-681C-4309-A296-53D8B710797E-low.pngFigure 7-3 10-µs Alert Response Window

The delay shown in Figure 7-3 represents the response time of the device with a 10-µs delay setting. With a
50-µs delay setting, an additional 40 µs is added to the timing response, as shown in Figure 7-4. A 100-µs delay setting adds 90 µs to the response time, as shown in Figure 7-5.

GUID-294DF770-C1CE-44AA-9FEE-5A7B66AEE129-low.pngFigure 7-4 50-µs Alert Response Window
GUID-562E928D-10FE-4029-899D-6736FCD324E5-low.pngFigure 7-5 100-µs Alert Response Window